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Doc

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Reply with quote  #1 
I'm hoping that someone here can shed some light on our Webasto and what appears to be a leak. We went away for the weekend and I noticed that our Webasto didn't seem to be heating up as well or as hot as normal. I had a bit of a look in the front box and noticed the attached [photos]. Anyone else had anything similar?

Attached Images
jpeg DSC_5594.JPG (690.65 KB, 73 views)
jpeg DSC_5591.JPG (517.94 KB, 70 views)
jpeg DSC_5593.JPG (745.11 KB, 65 views)
jpeg DSC_5590.JPG (507.34 KB, 64 views)

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SVX17

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Reply with quote  #2 
Hi Doc,
That coloured liquid you can see is called "glycol". It appears that you have a small leaked around the level viewing window.
In simple terms, your Webasto burns diesel fuel in the furnace, that in turn heats the glycol fluid. The heated glycol travels through a heat exchanger where the water is heated and pumped throughout your trailer.
The small amount of glycol that has leaked is unlikely to be the cause of the issues you are experiencing with heating water.
If you can still see the glycol fluid in the level viewing window then the level is okay.
I would suggest you have the unit serviced at authorised Webasto service centre.
Cheers
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Doyta

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Reply with quote  #3 
definitely a problem there mate. shouldn't leak there or any where, still under warranty?
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Doc

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Reply with quote  #4 
Thanks SVX17 - can't see much at all through that viewing window but can't tell whether that's because the level has dropped too far or because the window has crazed a bit (which is what it looks like to my untrained eye). Will look for an authorised repairer today.

Thankfully Doyta it should still be under warranty (campertrailer is less than 18 months old) though I'm hoping it's not one of those "but it was imported with the campertrailer from SA like the fridge was so we won't warrant it here (but not like the fridge in that respect though as it was replaced)".
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Doc

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So...took the campertrailer to the good folk at Caravan Supplies (Underwood or on Brisbane's southside for those of you not from around here). Had it for a day and replaced the holding tank. Apparently the view plug hadn't been fitted correctly but it wasn't obvious whether it was a manufacturing fault or something that occurred during installation. It was thought that the most likely of the 2 was a manufacturing problem because it didn't appear that the view plug (or whatever it's called) could be screwed in far enough. So they replaced the whole tank and new Glycol - they'll take it with Webasto.

If you have a close look at the photo you'll see a large piece missing from one side of the threaded part - apparently that has corroded away which is from whence the Glycol was leaking.

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jpeg DSC_5605.JPG (528.51 KB, 32 views)

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filbee56

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Reply with quote  #6 
Thanks Doc,
Certainly something that all UEV owners, with Webasto heaters, should keep an eye on periodically. 

All the best, Filbee56

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William the Conqueror

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Reply with quote  #7 
Doc

There seems to be a significant amount of corrosion (the green stuff) on the inside of the viewing plug. That is definitely not normal.

Glycol is used in these systems for two reasons. One is its low boiling point and ability to transfer heat (across the heat exchanger and into the water) and the second is its anti-corrosive properties.

Did the service centre take a sample of the glycol? This may be the source of the fault.

Cheers

Anthony

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Doc

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Reply with quote  #8 
Don't know if they took samples but, the way it was explained to me, the corrosion was partly due to the unit not being hermetically sealed once the seal failed. The only thing I noticed since was that the Glycol in the new container is nowhere nearly as yellow as the old stuff
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William the Conqueror

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Reply with quote  #9 
It will be interesting to see what the service centre get back from Webasto. If you can, can you follow it up and let us know - it may mean we need to retro fit another viewing glass to be sure.

The reason I asked if a sample was taken was due to the colour - it should be a flourescent green.

These systems require a specific concentration and pH of glycol to work efficiently. If the concentration was incorrect and did not allow adequate heat transfer, you would observe less effective heating - as you have. If the incorrect glycol was used and it had a lower pH than it should, this would account for the corrosion. This is one of the reasons why vehicle manufacturers recommend their own (or a particular) glycol for the vehicles. It is matched to the metallurgy of the engine components.

The suggestion that the corrosion occurred after the seal failure is a bit strange. The photo would indicate that the thread has corroded causing the seal to fail! Agreed that once the seal failed it would not be hermetically sealed and would exacerbate the problem, particularly if the glycol had a low pH (making it more acidic). The combination of heat and acid could cause such a failure.

Let us know how you go with info from the service centre.

Cheers

Anthony

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Doc

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Reply with quote  #10 
Will do Anthony. I'll give them a call tomorrow and ask them if they noticed anything off about the Glycol too
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150cruiser

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Reply with quote  #11 
Gents,

digging up an old thread, but does anybody know where you can get the glycol from (Perth) or where a service agent in Perth is? I looked on their website and the guys listed don't do them anymore.

Mine just stopped working after 6 months use - it runs bit doesn't heat water. The glycol tank seems to be empty so I wonder if it is shutting down after 2 mind on some form of overload...?
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comjero

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Reply with quote  #12 
Hi 150cruiser,

You can buy glycol from almost any petrol station or auto spare parts supplier eg supercheap auto. Use it neat so don`t add water to it, the colour is just a dye they put in it,most are as Anthony stated a fluro green colour if your still not sure call Webasto`s head office in Sydney they will set you straight.
As for your system shutting down I`d say this goes hand in hand with the loss of glycol in your header tank. The unit goes through a pre operational start up check where it tests whether it has sufficent  fuel,air,pump operation and glycol to operated, if it senses any of these are missing or insufficient for continued operation it will shut its self down. You maybe able to download an operational manual from their web site that might assist you.
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William the Conqueror

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Reply with quote  #13 
Glycol mix needs to be at 25% concentration otherwise it will not transfer heat effectively or will result in the glycol boiling.

This doesn't mean you dilute premixed concentrate though. You can by already diluted mix or concentrate.

Webasto dealers in WA listed below. I'm not sure how up to date they are.

Care A Van
52 Mordaunt Circuit, 6155 Canning Vale
Contact Details
Phone +61 (8) 92563300
Fax +61 (8) 92564300
E-mail info@careavan.com.au

Madurah Caravan & Rv Centre
18 Panton Road, 6210 Mandurah
Contact Details
Phone +61 (8) 95817300
Fax +61 (8) 95817170
E-mail jusatin@mandurahrv.com

Batavia Coast
215 Floses Road, 6530 Geraldton
Contact Details
Phone +61 (08) 99231601
E-mail retail@1800caravan.com.au

Cheers

Anthony

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150cruiser

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Reply with quote  #14 
Thanks Comjero and Anthony

Finally got onto Webasto and there advice is for the thermo top E use the glycol ( any auto radiator coolant) neat. I'll try refilling, bleeding the system and see if that works as there is a thermal shutdown if low. Hopefully that works.

As for the WA service agents, I rang all those listed and they apparently don't service them.

Cheers
Craig
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William the Conqueror

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Reply with quote  #15 
That's great isn't it - straight of the webasto website as authorised service agents and they don't service the units.

Did Webasto say whether the coolant you use "neat is concentrate or premix? The majority of the premises are at 25% concentration like I mentioned above. Using concentrate "neat" will not allow the unit to work correctly.

I haven't replaced the glycol in mine before, can you give us an idea of how many litres you use to recharge the system.

Cheers

Anthony

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